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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Deferred Tax Assets, Valuation Allowance $ 186,618 $ 200,081
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (13,500)  
Undistributed Earnings of Foreign Subsidiaries 2,700  
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 300  
Liability for Uncertainty in Income Taxes, Current 0  
Unrecognized Tax Benefits, Ending Balance 0 $ 0
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 10,900  
Other Tax Credit Carryforwards [Member]    
Tax Credit Carryforward, Amount 3,200  
Power Quality Systems, Inc [Member]    
Operating Loss Carryforwards 3,700  
Infinia Technology Corporation (ITC) [Member]    
Operating Loss Carryforwards 300  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards 755,500  
Operating Loss Carryforwards Indefinite 86,700  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 201,300  
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member]    
Operating Loss Carryforwards $ 900